oj.uz

Submission #945537

# Submission time Handle Problem Language Result Execution time Memory
945537 2024-03-14T04:05:27 Z berr Spring cleaning (CEOI20_cleaning) C++17
100 / 100
 113 ms 29524 KB 
#include <bits/stdc++.h>
using namespace std;
 
 
struct LCA {                                                
        int root, n, cnt;
 
        vector<vector<int>> adj;  
        vector<array<int, 21>> par;
        vector<int> ti, to, d;
 
        LCA(vector<vector<int>> aadj, int r){ 
            adj = aadj; n = adj.size();
            par.resize(n);
            d.assign(n, 0);
            root = r; cnt = 0;
            ti.resize(n); to.resize(n);
 
            d[root] = -1;
            dfs(root, root);
 
            for (int i = 1; i < 21; i++){
                for(int l = 0; l<n; l++){
                    par[l][i] = par[par[l][i-1]][i-1];
                }
            }
        }
        
        void dfs(int v, int p){
            par[v][0] = p;
            ti[v] = cnt++;
            d[v] = d[p]+1;
            for (auto i: adj[v]){
                if (i != p) dfs(i, v); 
            }
            to[v] = cnt++;
        }
 
        bool ia(int u, int v){
            return ti[u] <= ti[v] && to[u] >= to[v];
        }
 
        int operator()(int u, int v){
 
            if(ia(u, v)) return u;
            if(ia(v, u)) return v;
 
            for(int i = 20; i>=0; i--){
                if(!ia(par[u][i], v)) u=par[u][i];
            }
 
            return par[u][0];
        }
      
      int distance(int u, int v){
        return d[u]+d[v]-2*d[(*this)(u, v)];
      }
};  
 
int32_t main(){
    ios_base::sync_with_stdio(false); cin.tie(0);
 
    int n, q; cin >> n >> q;
 
    vector<vector<int>> g(n);
    vector<int> c(n);
    vector<array<int, 2>> count(n);
    int leafs=0, root=0;
    for(int i =0; i<n-1; i++){
        int x, y; cin >> x >> y;
        x--; y--;
        g[x].push_back(y);
        g[y].push_back(x);
 
        if(g[x].size()>1) root = x;
        if(g[y].size()>1) root = y;
    }
 
   LCA lca(g, root);
    vector<int> vis(n), tin(n), tout(n);
 
    int cnt = 0;
    auto dfs=[&](int v, int p, auto&& dfs)->void{
        tin[v] = cnt++;
        for(auto i: g[v])
            if(i!=p) dfs(i, v, dfs), c[v]+=c[i];
        
        if(g[v].size()==1) c[v]++, leafs++;
        else vis[v] = 1;
 
        tout[v] = cnt++;
    };
    
    int ans = 0;
 
    auto dfs2=[&](int v, int p, auto&& dfs2)->void{
        //cout<<v+1<<" "<<c[v]<<"\n";
        if(c[v] %2) count[v][1]++;
        else count[v][0]++, ans++;
        for(auto i: g[v]){
            if(i!=p){
                count[i][0]+=count[v][0];
                count[i][1]+=count[v][1];
                dfs2(i, v, dfs2);
            }
        }
    };
 
    dfs(root, root, dfs);
    dfs2(root, root, dfs2) ;
 
    int tmpans = ans, tmpleafs=leafs;
    while(q--){
        int d; cin >> d;
        vector<int> ar(d),a, up;
 
        for(auto &i: ar) cin >> i, i--;
 
        sort(ar.begin(), ar.end(), [&](int x, int y){
            return tin[x] < tin[y];
        }); 
 
        int k=1;
        for(int i=1; i<d; i++){
            if(ar[i]==ar[i-1])k++;
            else{
                 if(g[ar[i-1]].size()==1){
                    leafs+=k-1;
                    if(k%2==0) a.push_back(ar[i-1]);
 
                    k = 1;
                }
                else{
                    leafs+=k;
                    if(k%2==1) a.push_back(ar[i-1]);
                    k=1;
                }
            }
        }
 
        if(g[ar[d-1]].size()==1){
            leafs+=k-1;
            if(k%2==0)  a.push_back(ar[d-1]);
        }
        else{
            leafs+=k;
            if(k%2==1)  a.push_back(ar[d-1]);
        }
 
        up = a; 
 
        if(up.size()){
           
            for(int i=0; i<a.size()-1; i++){
                up.push_back(lca(a[i], a[i+1]));
            }   
 
 
            sort(up.begin(), up.end(), [&](int x, int y){
                return tin[x] < tin[y];
            });
            
            vector<int> upp;
 
            for(int i=0; i<up.size(); i++){
                if(i==0||up[i]!=up[i-1]) upp.push_back(up[i]);
            }
            up=upp;
            upp.clear();
 
 
            if(up.size()){
                stack<int> st;
                st.push(0);
 
                vector<int> p(up.size()), v(up.size()), s(up.size());
                vector<vector<int>> adj(up.size());
                vector<int> aa(up.size());
 
                sort(up.begin(), up.end(), [&](int x, int y){
                    return tin[x] < tin[y];
                });
 
                for(int i=1; i<up.size(); i++) {
                    while(st.size() && tout[up[st.top()]] < tin[up[i]]){
                        st.pop();
                    }
                    if(st.size())
                    adj[st.top()].push_back(i), aa[i]++, p[i]=st.top();
                    else p[i]=i;
                    st.push(i);
                }   
 
                auto dfsa=[&](int ve, auto&&dfsa)->void{
 
                    for(auto i: adj[ve]){
                        dfsa(i, dfsa), v[ve]+=v[i];
                    }
                };
                int pos=0;
                for(int l=0; l<a.size(); l++){
                    while(pos<up.size()&&up[pos]!=a[l]) pos++;
                    if(pos<up.size()&&up[pos]==a[l]) v[pos]++;
                }
 
                for(int i=0; i<up.size(); i++){
                    if(aa[i]==0) dfsa(i, dfsa);
                }
 
 
 
                 for(int i=0; i<up.size(); i++){
                    if(p[i]==i){
                        auto x = count[up[i]];
                        if(v[i]%2){    
 
                            ans-=x[0]; ans+=x[1];
 
                        }
 
 
                    }
                    else if(v[i]%2){
                        auto x=count[up[i]], y=count[up[p[i]]];
                        x[0]-=y[0];
                        x[1]-=y[1];
                        ans-=x[0]; ans+=x[1];
                    }
                }
 
            }
        }
 
        if((leafs%2)!=0) cout<<-1<<"\n";
        else cout<<ans-1+d+n-1<<"\n";
 
        ans=tmpans; leafs=tmpleafs;
    }
}

Compilation message

cleaning.cpp: In function 'int32_t main()':
cleaning.cpp:154:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  154 |             for(int i=0; i<a.size()-1; i++){
      |                          ~^~~~~~~~~~~
cleaning.cpp:165:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  165 |             for(int i=0; i<up.size(); i++){
      |                          ~^~~~~~~~~~
cleaning.cpp:184:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  184 |                 for(int i=1; i<up.size(); i++) {
      |                              ~^~~~~~~~~~
cleaning.cpp:201:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  201 |                 for(int l=0; l<a.size(); l++){
      |                              ~^~~~~~~~~
cleaning.cpp:202:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  202 |                     while(pos<up.size()&&up[pos]!=a[l]) pos++;
      |                           ~~~^~~~~~~~~~
cleaning.cpp:203:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  203 |                     if(pos<up.size()&&up[pos]==a[l]) v[pos]++;
      |                        ~~~^~~~~~~~~~
cleaning.cpp:206:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  206 |                 for(int i=0; i<up.size(); i++){
      |                              ~^~~~~~~~~~
cleaning.cpp:212:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  212 |                  for(int i=0; i<up.size(); i++){
      |                               ~^~~~~~~~~~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 35 ms 5720 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 1628 KB Output is correct
2 Correct 11 ms 1648 KB Output is correct
3 Correct 48 ms 28668 KB Output is correct
4 Correct 45 ms 20176 KB Output is correct
5 Correct 65 ms 28616 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 2348 KB Output is correct
2 Correct 12 ms 2140 KB Output is correct
3 Correct 65 ms 29524 KB Output is correct
4 Correct 70 ms 28196 KB Output is correct
5 Correct 57 ms 27224 KB Output is correct

Subtask #4
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 36 ms 6232 KB Output is correct
2 Correct 17 ms 5720 KB Output is correct
3 Correct 11 ms 5724 KB Output is correct
4 Correct 12 ms 6268 KB Output is correct
5 Correct 12 ms 6236 KB Output is correct
6 Correct 27 ms 5980 KB Output is correct

Subtask #5
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 62 ms 18000 KB Output is correct
2 Correct 65 ms 18012 KB Output is correct
3 Correct 40 ms 9304 KB Output is correct
4 Correct 63 ms 18012 KB Output is correct
5 Correct 66 ms 18008 KB Output is correct

Subtask #6
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 100 ms 27472 KB Output is correct
2 Correct 110 ms 29268 KB Output is correct
3 Correct 113 ms 29012 KB Output is correct
4 Correct 111 ms 28496 KB Output is correct

Subtask #7
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 35 ms 5720 KB Output is correct
3 Correct 10 ms 1628 KB Output is correct
4 Correct 11 ms 1648 KB Output is correct
5 Correct 48 ms 28668 KB Output is correct
6 Correct 45 ms 20176 KB Output is correct
7 Correct 65 ms 28616 KB Output is correct
8 Correct 12 ms 2348 KB Output is correct
9 Correct 12 ms 2140 KB Output is correct
10 Correct 65 ms 29524 KB Output is correct
11 Correct 70 ms 28196 KB Output is correct
12 Correct 57 ms 27224 KB Output is correct
13 Correct 36 ms 6232 KB Output is correct
14 Correct 17 ms 5720 KB Output is correct
15 Correct 11 ms 5724 KB Output is correct
16 Correct 12 ms 6268 KB Output is correct
17 Correct 12 ms 6236 KB Output is correct
18 Correct 27 ms 5980 KB Output is correct
19 Correct 62 ms 18000 KB Output is correct
20 Correct 65 ms 18012 KB Output is correct
21 Correct 40 ms 9304 KB Output is correct
22 Correct 63 ms 18012 KB Output is correct
23 Correct 66 ms 18008 KB Output is correct
24 Correct 100 ms 27472 KB Output is correct
25 Correct 110 ms 29268 KB Output is correct
26 Correct 113 ms 29012 KB Output is correct
27 Correct 111 ms 28496 KB Output is correct
28 Correct 67 ms 16768 KB Output is correct
29 Correct 95 ms 29056 KB Output is correct
30 Correct 60 ms 28636 KB Output is correct
31 Correct 67 ms 28180 KB Output is correct
32 Correct 63 ms 17996 KB Output is correct
33 Correct 84 ms 23380 KB Output is correct
34 Correct 103 ms 28500 KB Output is correct
35 Correct 99 ms 29276 KB Output is correct